The Collaborative International Dictionary
Regular octagon
Octagon \Oc"ta*gon\, n. [Gr. ? eight-cornered; 'okta- (for 'oktw` eight) + ? an angle: cf. F. cctogone.]
(Geom.) A plane figure of eight sides and eight angles.
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Any structure (as a fortification) or place with eight sides or angles.
Regular octagon, one in which the sides are all equal, and the angles also are all equal.
Usage examples of "regular octagon".
A titanic dome a thousand feet high, mounted on a great base fifteen hundred feet across shaped as a regular octagon.